WO2006075733A1 - Appareil de communication - Google Patents

Appareil de communication Download PDF

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Publication number
WO2006075733A1
WO2006075733A1 PCT/JP2006/300422 JP2006300422W WO2006075733A1 WO 2006075733 A1 WO2006075733 A1 WO 2006075733A1 JP 2006300422 W JP2006300422 W JP 2006300422W WO 2006075733 A1 WO2006075733 A1 WO 2006075733A1
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WO
WIPO (PCT)
Prior art keywords
antenna
preamble
signal
transmission
unit
Prior art date
Application number
PCT/JP2006/300422
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English (en)
Japanese (ja)
Inventor
Shimpei To
Yasuhiro Hamaguchi
Hideo Nanba
Seiichi Sampei
Hiroshi Harada
Masafumi Moriyama
Original Assignee
Sharp Kabushiki Kaisha
Osaka University
National Institute Of Information And Communications Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sharp Kabushiki Kaisha, Osaka University, National Institute Of Information And Communications Technology filed Critical Sharp Kabushiki Kaisha
Priority to EP06711703.6A priority Critical patent/EP1843499B1/fr
Priority to JP2006553002A priority patent/JP4569929B2/ja
Publication of WO2006075733A1 publication Critical patent/WO2006075733A1/fr
Priority to US12/752,797 priority patent/US8514962B2/en
Priority to US13/669,383 priority patent/US8743993B2/en
Priority to US14/254,529 priority patent/US20140226564A1/en
Priority to US15/189,867 priority patent/US10833903B2/en
Priority to US17/082,422 priority patent/US11283659B2/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0602—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using antenna switching
    • H04B7/0608—Antenna selection according to transmission parameters
    • H04B7/061—Antenna selection according to transmission parameters using feedback from receiving side
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/084—Equal gain combining, only phase adjustments
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/16—Code allocation
    • H04J13/18—Allocation of orthogonal codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0204—Channel estimation of multiple channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated

Definitions

  • the present invention relates to a communication device, and more particularly to a wireless transmission device including a plurality of antennas and a wireless reception device that receives a signal from the wireless transmission device.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the configuration of a data packet in IEEE802.11a will be described with reference to FIG.
  • the data packet used in IEEE802.11a consists of preambles A and B, data signals, and power.
  • This preamble A is used for OFDM symbol synchronization and frequency synchronization
  • preamble B is used for antenna identification and channel estimation.
  • These two preambles are both predetermined signals, and are known signals on the receiving side.
  • FIG. 12 and FIG. 13 show configuration examples of the OFDM modulation / demodulation circuit, respectively.
  • N is the number of subcarriers used.
  • FIG. 12 is a functional block diagram of a general OFDM modulation circuit.
  • reference numeral 10000 is an error correction code section
  • reference numeral 1001 is a serial / parallel conversion section (S / P conversion section)
  • reference numeral 1002 is a mapping section
  • reference numeral 1003 is IDFT (inverse discrete Fourier transform).
  • Conversion: Inverse 1004 is a parallel / serial (P / S converter)
  • 1005 is a preamble A generator
  • 1006 is a preamble B generator
  • 1007 is a multiplex.
  • 1008 is a guard interval insertion unit
  • 1009 is a digital / analog conversion unit (D / A conversion unit)
  • 1010 is a radio transmission unit
  • 1011 is an antenna.
  • the error correction coding unit 1000 performs error correction coding on the transmitted information data.
  • S / P conversion section 1001 performs serial / parallel conversion for data necessary for modulation of each carrier, and mapping section 1002 modulates each carrier.
  • IDFT is performed in the IDFT unit 1003.
  • IDFT is used for OFDM modulation.
  • the number of points is set to 2 n
  • IFFT Inverse Fast Fourier Transform
  • the value of 2 n closest to N is usually used as the number of IFFT points.
  • the P / S converter 1004 converts the data into serial data, and the multiplexer 1007 time-multiplexes with the preamble A and the preamble B, resulting in the packet configuration shown in FIG. Then, in the GI (guard interval) insertion part 1008, a guard interval is inserted. The guard interval is inserted to reduce intersymbol interference when receiving OFDM signals. Further, the data is converted into an analog signal by the D / A conversion unit 1009 and then converted to a frequency to be transmitted by the wireless transmission unit 1010, and then the antenna 101 beam packet is transmitted.
  • GI guard interval
  • FIG. 13 is a functional block diagram showing a configuration example of an OFDM demodulation circuit. As shown in Fig. 13, the receiver side basically performs the reverse process of the transmission process.
  • reference numeral 1020 is an antenna
  • reference numeral 1021 is a wireless receiver
  • reference numeral 1022 is an A / D (analog / digital) converter
  • reference numeral 1023 is a synchronization section
  • reference numeral 1024 is a GI removal section
  • reference numeral 1025 is S / P Transformer
  • code 1 026 is a DFT (Discrete Fourier Transform) unit
  • code 1027 is a switching switch
  • code 1028 is a preamble multiplier
  • codes 1029 and 1030 are multipliers
  • code 1031 is a demapping unit
  • code 1032 is The P / S conversion unit
  • code 1033 is an error correction decoding unit.
  • the demodulation circuit usually uses FFT instead of DFT.
  • the radio wave received by antenna unit 1020 is frequency-converted by radio reception unit 1021 to a frequency band where A / D conversion is possible.
  • the data converted into a digital signal by the A / D conversion unit 1022 is synchronized with the OFDM symbol using the preamble A by the synchronization unit 1023 and the guard interval is set by the GI removal unit 1024. Removed. Thereafter, the S / P conversion unit 1025 performs parallel conversion. Then, after DFT in DFT section 1026, received preamble B after DFT is sent to preamble multiplier 1028 by switching switch 1027, and the received data signal after DFT is sent to multiplier 1029.
  • the preamble multiplier 1 028 multiplies the complex conjugate of the received preamble B and the preamble B used on the transmission side (multiplication in the frequency domain), and estimates the propagation path.
  • propagation path estimation and propagation path compensation using a preamble (preamble B) will be briefly described using mathematical expressions.
  • p (f) be the preamble used on the transmission side and s (f) the information signal.
  • these are expressed as signals in the frequency domain.
  • c (f) the fluctuation experienced by the propagation path after the preamble or information signal is transmitted.
  • c (f) is a complex function that gives different amplitude fluctuation and phase rotation for each subcarrier.
  • the preamble multiplier 1028 takes the complex conjugate of p ′ (f) and multiplies the received signal by the preamble p (f) used on the transmission side. . This is expressed in equation (3)
  • Equation (3) The output (Equation (3)) of this preamble multiplication unit 1028 is sent to the multiplication unit 1029 and the multiplication unit 1030, and is multiplied with the reception data signal and the reception preamble, respectively.
  • the output of the multiplier 10 29 is shown in Equation (4)
  • the output of the multiplier 1030 is shown in Equation (5).
  • Equation (4) by multiplying the received information signal by the output of the preamble multiplier 1028, the effect of phase rotation due to the propagation path fluctuation c (f) is compensated and equal to the transmission signal s (f). A signal having a phase is obtained.
  • the outputs of the multiplication unit 1029 and the multiplication unit 1030 obtained in this way (Equations (4) and (5) are input to the demapping unit 1031, and the preamble after propagation path compensation shown in Equation (5) is obtained.
  • the demapping of the information signal is performed for each subcarrier with reference to the data, and then the necessary data is serialized in the P / S conversion section 1032, the error correction is performed in the error correction decoding section 1033, and the transmission data is Decrypted.
  • Non-Patent Document 1 there is a method described in Non-Patent Document 1 as one of methods aiming at high-speed OFDM and high quality. Normally, different information bits are assigned to each subcarrier of OFDM, but Non-Patent Document 1 uses a method in which the same information bits are assigned to all subcarriers. In this way, in order to maintain a high transmission rate while assigning the same information bits to all subcarriers, Non-Patent Document 1 sets a different phase rotation amount for each information bit, and sets the set phase rotation to the subcarrier. Thus, different information bits can be assigned to the same subcarrier for transmission.
  • FIG. 14 shows a part of the transmitter configuration shown in Non-Patent Document 1.
  • the information bits mapped by mapping section 1050 (targeted in BPSK modulation in Non-Patent Document 1) are subcarriers in copy section 1051. Copied for a few minutes (here N is the number of subcarriers)
  • the carrier modulation is input to the phase rotation unit 1052.
  • this subcarrier modulation / phase rotation unit 1052 as shown in FIG. 14, information bits are assigned to all subcarriers, and phase rotation set for each information bit is given to each subcarrier.
  • the phase rotation given to the first subcarrier of the kth information bit is 0, and the phase rotation given to the nth subcarrier is (n-1) ⁇ , Continuous phase rotation between
  • Non-Patent Document 1 shows that such a configuration improves reception characteristics compared to normal OFDM and ensures a high transmission rate.
  • Non-Patent Document 1 “DA Wiegandt, Z. Wu, CR Nassar,“ High-throughput, high-perf ormance OFDM via pseudo-orthogonal carrier interferometry spreading codes ”, IEE E Transactions on Communications, vol. 51, no. 7, Jul. 2003, pp. 1123-1134. Disclosure of the Invention
  • An object of the present invention is to improve the accuracy of channel estimation when receiving signals with a plurality of antenna forces.
  • the delay profile is calculated separately on the receiving side.
  • the delay profile of the signals arriving at each antenna or each cell power is separated on the receiving side, and the transmission antenna or source base is separated.
  • Station identification and propagation path estimation are performed.
  • the number of delay profiles to be separated is large, it is possible to separate the delay profiles with high accuracy by using different preamble patterns in combination.
  • the present invention can be applied to a case where a single transmission apparatus includes a plurality of antennas, and transmission antennas can be selected in transmission diversity. It is also possible to determine the number of transmit antennas in a MIMO (Multi Input Multi Output) system.
  • MIMO Multi Input Multi Output
  • the present invention can also be applied when receiving signals from a plurality of transmission apparatuses.
  • it can be used for base station identification when receiving signals from a plurality of base stations.
  • time shift and code-based delay profile separation can be used together. That is, the base station can be identified by a code, and the time shift can be utilized for identifying a plurality of antennas in the base station.
  • FIG. 1 is a diagram showing an example of a packet format that is a target in the wireless communication technology according to an embodiment of the present invention.
  • FIG. 2 is a diagram showing a configuration example of a base station side transmission apparatus in the radio communication apparatus according to the first embodiment of the present invention.
  • FIG. 3 is a diagram showing a configuration example of a terminal-side receiver according to the first embodiment of the present invention.
  • FIG. 4 is a diagram showing an example of a delay profile obtained by the wireless communication technique according to the first embodiment of the present invention.
  • FIG. 4 (a) is a diagram showing a delay profile obtained on the receiving side when the preamble transmitted from the transmitting antenna X and the transmitting antenna Y is not subjected to phase rotation.
  • FIG. 4 (b) is a diagram showing a delay profile when the phase rotation is applied to the preamble transmitted from the transmitting antenna Y.
  • FIG. 5 is a diagram illustrating an example of cell arrangement targeted for radio communication technology according to a third embodiment of the present invention.
  • FIG. 6 is a diagram showing a configuration example of a base station side transmitting apparatus according to the third embodiment of the present invention.
  • FIG. 7 is a functional block diagram showing a configuration example of a terminal-side receiving device according to the third embodiment of the present invention.
  • FIG. 8 is a diagram showing a problem when the number of delay profiles to be separated, which is a premise of the wireless communication technology according to the fourth embodiment of the present invention, is large.
  • FIG. 9 is a diagram illustrating a configuration example of a transmission device according to a second embodiment of the present invention.
  • FIG. 10 is a diagram illustrating a configuration example of a receiving device according to a second embodiment of the present invention.
  • FIG. 11 is a diagram showing a flow of transmission / reception processing according to the second embodiment of the present invention.
  • FIG. 12 is a functional block diagram showing a configuration example of a general OFDM modulation circuit.
  • FIG. 13 is a functional block diagram showing a configuration example of a general OFDM demodulation circuit.
  • FIG. 14 is a functional block diagram showing a configuration example of a transmission device described in Non-Patent Document 1.
  • antenna unit 041 ⁇ Radio reception unit, 042—A / D conversion unit, 043... Synchronization unit, 044—GI removal unit, 045 .S / P conversion unit, 046, 052.DFT unit, 047... Switch switch, 048... Preamble multiplication unit 049—IDFT part, 050 ... Delay profile power measurement part, 051 ... Time filter, 053 ... Propagation path compensation 'demapping part, 054 ...! VS conversion unit, 055 ... error correction decoding unit.
  • the present invention uses the property that a signal in the time domain can be time-shifted by giving continuous phase rotation to each subcarrier used for multicarrier transmission, and is transmitted simultaneously from a plurality of antennas.
  • This technology is characterized in that a technique for separating multicarrier signals received via different propagation paths for each antenna is applied to antenna identification and base station identification. More specifically, the phase difference between successive subcarriers of the same preamble is made constant, and the signal is time-shifted for each antenna by giving a phase rotation of 2m ⁇ (m is an integer of 1 or more) for all carriers. It is realized by doing.
  • the number of subcarriers used in the target OFDM system is 64.
  • the packet format targeted in the radio communication technology according to the embodiment of the present invention is shown in FIG. 1 as described above.
  • the packet shown in FIG. 1 has preamble A, preamble B, and data.
  • preamble A is used for OFDM symbol synchronization and frequency synchronization
  • preamble B is used for antenna identification and propagation path estimation. These two preambles are both predetermined signals.
  • a discrete Fourier transform “inverse discrete Fourier transform” is mainly used as means for performing a Fourier transform “inverse Fourier transform” on a digital signal. It is also possible to use a fast Fourier transform. Also, when the inverse discrete Fourier transform is used on the transmitting side and the fast Fourier transform is used on the receiving side, or when the inverse fast Fourier transform is used on the transmitting side and the discrete Fourier transform is used on the receiving side, By performing phase rotation with adjustment taking into account the number of subcarriers used and the number of points used for fast Fourier transform, antenna identification and base station identification can be performed.
  • the wireless communication technology according to the first embodiment of the present invention is intended for downlink transmission
  • the present invention relates to an antenna selection method in the case where a transmission (base station) side has a plurality of antennas and performs transmission antenna selection diversity.
  • a transmission (base station) side has a plurality of antennas and performs transmission antenna selection diversity.
  • a plurality of antenna power OFDM signals are transmitted simultaneously, and the signals transmitted from the respective antenna power are separated on the receiving side, and the signal transmitted from which antenna power has the highest power and is received. Estimate what will be done.
  • FIG. 2 is a diagram illustrating a configuration example of a base station side transmission device in the wireless communication device according to the first embodiment of the present invention.
  • FIG. 2 a case where two transmission antennas are provided will be described as an example. As shown in FIG.
  • the base station side transmission apparatus includes a preamble A generation unit 010, a preamble B generation unit 011, phase rotation units 012 and 013, multiplex units 014 and 015, Error correction code unit 016, S / P conversion unit 017, mapping unit 018, switching switch 019, IDFT unit (IFFT may be used) 020, 026, P / S conversion units 0 21, 027, GKGuard Interval) insertion units 022 and 028, D / A conversion units 023 and 029, radio transmission units 024 and 030, and antenna units 025 and 031.
  • IFFT IFFT may be used
  • the preamble A generation unit 010 and the preamble B generation unit 011 generate preamble A and preamble B (see the packet format in FIG. 1), respectively. It is output to the plex units 014 and 015, and the preamble B is output to the phase rotation units 012 and 013.
  • the phase rotation units 012 and 013 to which the preamble B is input continuous phase rotation is given to each subcarrier of the preamble B.
  • phase rotation unit 012 does not give phase rotation
  • phase rotation unit 013 gives phase rotation to preamble B only.
  • phase rotation is given only to the second preamble in the packet transmitted from one antenna among the preambles transmitted from the two antenna cables provided in the base station side transmission apparatus.
  • the other preambles are not phase rotated.
  • the information data is subjected to error correction coding in error correction coding section 016 and mapped in mapping section 018 via S / P conversion section 017 in accordance with the modulation method.
  • the information signal generated in this manner is phase-multiplexed with the preamble after being subjected to the same phase rotation as that of the preamble B and transmitted.
  • the transmission antenna selection result in the previous packet is reflected, and only the antenna power determined to obtain high received power is transmitted. Therefore, the selection result of the transmission antenna from the terminal to the base station Force S feedback.
  • the antenna selection information received is sent to the switching switch 019, and the information signal is switched so that only the selected transmitting antenna power is transmitted.
  • information signals are transmitted only from one of the predetermined antennas.
  • the antenna unit 025 is selected as an example.
  • the antenna that transmits the information signal is selected, and the switching switch 019 is controlled to input the information signal only to the phase rotation unit 012, and is given to the preamble B by the phase rotation unit 012.
  • the phase rotation similar to the phase rotation is also given to the information signal (however, as described above, in this embodiment, the phase rotation amount given by the phase rotation unit 012 is 0).
  • the information signal thus provided with the phase rotation is time-multiplexed with the preamble in the multiplex unit 014, and then a guard interval is attached to each OFDM symbol in the GI insertion units 022 and 028.
  • the GI insertion unit 022 performs processing on the packets formed by the preambles A and B and the information signal force
  • the GI insertion unit 028 performs processing on the packets formed only by the preambles A and B.
  • the guard inverter After adding the guard inverter, it passes through the D / A conversion units 023 and 029 and the radio transmission units 024 and 030 provided for each transmission antenna, and from the antenna unit 025, preambles A and B and information Packets with signal strength are also transmitted from antenna unit 031 simultaneously with packets formed from preambles A and B.
  • the terminal-side receiver according to the present embodiment includes an antenna unit 040, a radio reception unit 041, an A / D conversion unit 042, a synchronization unit 043, a GI removal unit 044, and an S / P conversion unit 045, DFT unit (may be FFT) 046, 052, switching switch 047, preamble multiplication unit 0 48, IDFT unit (may be IFFT) 049, delay profile power measurement unit 050, time It has a filter 051, a propagation path compensation / demapping unit 053, a P / S conversion unit 054, and an error correction decoding unit 055.
  • DFT unit may be FFT
  • IDFT unit may be IFFT
  • antennas having different packets composed of preambles A and B and information signals and packets composed of preambles A and B are also transmitted simultaneously.
  • these packets are It is received simultaneously by one antenna 040 via different propagation paths.
  • a reception signal obtained by adding two packets that have passed through different propagation paths as described above is input to synchronization section 043 via radio reception section 041 and A / D conversion section 042.
  • synchronization unit 043 symbol synchronization is established using preamble A, and the subsequent processing is performed at an appropriate timing.
  • the S / P conversion unit 045 converts the serial signal into a parallel signal and inputs the parallel signal to the DFT unit 046. Is done.
  • the DFT unit 046 converts the received time domain signal into a frequency domain signal and sends it to the switching switch 047.
  • switching switch 047 switching control is performed so that the preamble B is sent to the preamble multiplication unit 048 and the information signal is sent to the propagation path compensation / demapping unit 053.
  • preamble multiplier 048 multiplies reception preamble B by the value obtained by normalizing the complex conjugate of preamble B used on the transmission side by the square of the amplitude of preamble B.
  • the reception preamble B indicates a signal obtained by adding two preambles B transmitted from two transmission antennas and arriving via different propagation paths.
  • this multiplication result is converted into a time domain signal by the IDFT unit 049, a delay profile of the propagation path through which the signals transmitted from the antenna unit 021 and the antenna unit 029 of the base station side transmitting device respectively pass is obtained. be able to.
  • the delay profile obtained here means the propagation response of the propagation path.
  • Figure 4 shows an example of the delay profile obtained in this way.
  • FIG. 4 (a) is a diagram showing a delay profile obtained on the reception side when phase rotation is not performed on the preamble transmitted from the transmission antenna X and the transmission antenna Y.
  • FIG. 4 (b) is a diagram showing a delay profile when the phase rotation is applied to the preamble transmitted from the transmission antenna Y.
  • the detailed configuration of the transmission device and the reception device is omitted in FIG. 4, but the configuration of the reception device is the same as that of FIG. 3, and the configuration of the transmission device is shown in FIG.
  • Fig. 4 (b) is a diagram showing a configuration example when there is no phase rotating unit
  • Fig. 4 (b) is a diagram showing a configuration example other than that shown in Fig.
  • the delay profile of the signal transmitted from the antenna X indicated by the solid line and the delay profile of the signal transmitted from the antenna ⁇ indicated by the dotted line are: On the receiving side, it is observed as synthesized and cannot be separated.
  • phase rotation is performed on each subcarrier of preamble ⁇ generation unit 011 (however, in this case, 012 of phase rotation units 012 and 013 is When the phase rotation amount is 0), the signal transmitted from antenna X and the signal transmitted from antenna ⁇ are given different time shifts based on the principle shown in equation (7).
  • the delay profile of the signal transmitted from the antenna X indicated by the solid line and the delay profile of the signal transmitted from the antenna ⁇ indicated by the dotted line are two delays separated in time from the reception side. Observed as a profile.
  • the transmitting side two antennas also apply different phase rotations to the transmitted signal in advance, and appropriate time filtering is performed on the receiving side (filtering starts according to the amount of phase rotation given on the transmitting side). It can be seen that the delay profile observed on the receiving side can be easily separated by performing time filtering that determines the sampling time or sampling points).
  • the separated delay profile is input to delay profile power measurement unit 050 shown in FIG. 3, and the first path power is observed to be high. Assume that a transmit antenna is selected. For this reason, the delay profile power measurement unit 050 inputs selection antenna information for selecting a transmission antenna whose power of the first path is observed to be high, and feeds it back to the base station side. The result of this selection will be reflected in the next downlink transmission.
  • the first pass is used in the following meaning.
  • radio waves arrive at the receiver via various paths, and therefore due to differences in path lengths. Therefore, there is a difference in the arrival time of radio waves.
  • the expression path usually refers to radio waves that arrive at a certain time (combined waves of multiple radio waves).
  • the first and first paths are the earliest radio waves that arrive. Means that.
  • the delay profile obtained in the IDFT unit 049 is input to the time filter 051 and unnecessary portions are removed, but the information signal following the preamble B is one of the transmitting side. Only the force of one antenna (for example, antenna unit 021) is transmitted, so when performing channel compensation of an information signal, only the channel variation between the antenna to which the information signal is transmitted and the receiving antenna is affected. It only has to be obtained. Therefore, the time filter 051 (Fig. 2) is configured to pass only the delay profile obtained from the preamble B to which the same antenna force as that of the information signal was transmitted, and as described above, filtering is started. The time or sample point is determined according to the phase rotation amount (time shift amount) given on the transmission side.
  • the filtering when the antenna unit 031 is selected starts the reference sample point force close to the given time shift, and 0 is inserted in the samples before the reference sample point.
  • the output of the time filter 051 is input to the DFT unit 052, and a propagation path fluctuation estimation value necessary for demodulating the information signal is obtained.
  • the obtained propagation path fluctuation estimated value and the received information signal are input to the propagation path compensation demapping unit 053, where propagation path compensation and demapping are performed.
  • the error correction decoding unit 055 performs error correction decoding through the P / S conversion unit 054, and information data is reproduced.
  • the transmission device and the reception device described above it becomes possible to separate the delay profiles of the reception signals from which OFDM signals transmitted simultaneously from different antennas arrive via different propagation paths. Therefore, it is possible to estimate the propagation path fluctuation with one symbol and select the transmission antenna when performing transmission diversity with high accuracy.
  • the power of all the nodes is summed instead of the force that selects the transmission antenna with the high power of the first path of the delay profile, and the total value is The configuration of selecting the transmitting antenna, etc. is the highest.
  • the wireless communication technology according to the first embodiment of the present invention described above utilizes the property that a signal in the time domain can be time-shifted by giving continuous phase rotation to each subcarrier used for multi-carrier transmission.
  • This technology separates multi-carrier signals transmitted simultaneously from multiple antennas and received via different propagation paths for each antenna.
  • MIMO Multi Input Multi Output
  • the radio communication technology according to the second embodiment of the present invention is intended for a MIMO system, and in particular, relates to a method for determining the number of transmission antennas used when performing MIMO transmission according to the propagation path condition. It is.
  • FIG. 9 shows a configuration example of a transmission apparatus according to the second embodiment of the present invention.
  • FIG. 9 is a diagram illustrating a configuration example of a transmission apparatus when the number of transmission antennas is three.
  • the transmission apparatus according to the present embodiment includes a preamble A generation unit 200, a preamble B generation unit 201, phase rotation units 202, 203, and 204, multiplex units 205, 206, and 207, Data modulation unit 208, switching switch 209, IDFT unit 210, 216, 222, P / S conversion unit 211, 217, 223, GI insertion unit 212, 218, 224, D / A conversion unit 213 219, 225, wireless transmission units 214, 220, and 226, and antenna units 215, 221, and 227.
  • the transmission apparatus according to the present embodiment includes two preamble generation units 200 and 201 and output signals from these preamble generation units 200 and 201 directly or via a phase rotation unit.
  • phase phase rotation unit 202, 203, 204 preamble B
  • phase rotation amount phase rotation amount that differs for each antenna system
  • a guard interval is added at the GI insertion section to the signal that has been subjected to IDFT and P / S conversion in each antenna system.
  • D / A conversion is performed, and after the frequency is converted into the radio frequency band in the radio transmission unit, each signal stream of the antenna unit is transmitted.
  • FIG. 10 is a diagram illustrating a configuration example of a receiving device used in the radio communication technology according to the present embodiment.
  • FIG. 10 is a diagram illustrating an example when the number of reception antennas is three.
  • the receiving apparatus according to the present embodiment includes antenna units 250, 260, 270, radio receiving units 251, 261, 271, A / D conversion units 252, 262, 272, and a synchronization unit.
  • antenna units 250, 260, and 270 shown in FIG. 10 signals transmitted from a plurality of antennas provided in the transmission apparatus and received via the propagation path are respectively received.
  • signals transmitted from a plurality of antennas provided in the transmission apparatus and received via the propagation path are respectively received.
  • antenna unit 250 shown in FIG. 10 when three transmissions of information signal streams having different antenna forces are transmitted in the transmission apparatus, a signal in which three information signal streams are mixed through different propagation paths is received.
  • antenna units 260 and 270 also receive a signal in which three information signal streams are mixed through different propagation paths.
  • the radio reception units 251, 261, and 271 perform frequency conversion to a frequency band where A / D conversion is possible, and the A / D conversion units 252, 262, and 272 perform A / D conversion. Then, the OFDM symbols are synchronized in the synchronization units 253, 263, and 273. The synchronization processing in the synchronization units 253, 263, and 273 is performed using the preamble A. After that, the guard interval is removed by the GI removal units 2 54, 264, 274, and after the S / P conversion by the S / P conversion units 255, 265, 275, the time domain in the DFT units 256, 266, 276 The received signal is converted to the frequency domain. In switching switches 257, 267, and 277, preamble B is sent to preamble multipliers 258, 268, and 278, and the received information signal is demodulated to 281. Controlled to be sent to.
  • Each of the preamble multipliers 258, 268, and 278! / Receives the value obtained by normalizing the complex conjugate of preamble B used on the transmission side by the square of the amplitude of preamble B, and Multiplying with Bmble B is performed.
  • this multiplication result is input to IDFT sections 259, 269, and 279, as described in the previous embodiments, the delay profile of the propagation path through which the signal transmitted from each transmitting antenna passes is obtained. It is obtained in a state where each transmitting antenna is separated. This is because, on the transmitting side, a different phase rotation is given to the preamble for each antenna, and therefore the time signal is time-shifted for each antenna from the relationship of Equation (7).
  • the demodulating unit 281 can demodulate the information data by adopting a configuration in which the received information signal is input to the demodulating unit 281.
  • FIG. 11 is a flowchart showing a control flow when the number of antennas that transmit information signal streams is changed according to the propagation path condition in the MIMO system transmitting / receiving apparatus having the configuration described above. .
  • the control flow on the transmission side will be described.
  • the phase rotation amount given in the phase rotation unit is set to 0 (no phase rotation).
  • a signal consisting only of preambles A and B is transmitted by only one antenna (steps 001 to 002).
  • the receiving apparatus receives the information on the number of transmitting antennas on which the receiving side force is also fed back.
  • the antenna B is set to a different value for each antenna regarding the preamble B to be transmitted and the amount of phase rotation given to the information signal (step 004).
  • Data packets are transmitted using the number of antennas notified in the antenna number information. However, as described above, a different information signal stream is transmitted for each antenna.
  • preamble A and preamble sent by the transmitting side are transmitted.
  • a signal including only B is received by three receiving antennas (step 010), and the same processing as the demodulation procedure described above is performed, and the delay profiles are respectively set in the IDFT units 259, 269, and 279.
  • Calculate Step 011.
  • the calculated delay profile is sent to the maximum delay time measurement unit 280 shown in FIG. 10, and the delay time ⁇ max of the path with the longest delay time (latest arrival) among all delay profiles is calculated ( Step 012).
  • steps 013 and 015 it is determined how much of this ⁇ max occupies the GI (guard interval) length.
  • step 013 ⁇ max is compared with 1/3 of the GI length. If it is determined that ⁇ max is shorter (Yes), the process proceeds to step 014, and ⁇ max is determined to be longer. If yes, go to (No) Step 015. If it is determined in step 013 that ⁇ max is shorter, the amount of phase rotation given to preamble B transmitted from the three transmission antennas is set to 0, for example, in phase rotation unit 202 and in phase rotation unit 203. By setting the phase rotation amount so that the time shift amount is 1/3 of the GI length, the phase rotation unit 204 sets the phase rotation amount so that the time shift amount is 2/3 of the GI length, so that the delay profiles on the receiving side Separation is possible without interference. Therefore, in this case, the number of transmitting antennas information is set to 3 as shown in step 014.
  • step 013 determines whether transmission is performed using three antennas. If transmission is performed using three antennas, delay profiles will interfere with each other on the receiving side (see FIG. 8 (b)). ), Correct propagation path estimation cannot be performed. In other words, delay profiles transmitted from different antennas at the base station interfere with each other and cannot be separated. Therefore, in this case, without performing transmission using three antennas, the process proceeds to step 015 and ⁇ max is compared with half the GI length.
  • step 015 If it is determined in step 015 that ⁇ max is shorter than the half of the GI length (YES), the amount of phase rotation given to preamble B transmitted from the two transmission antennas For example, by setting the phase rotation amount to 0 in the phase rotation unit 202 and the phase rotation amount in which the time shift amount is 1 ⁇ 2 of the GI length in the phase rotation unit 203, the delay profiles do not interfere with each other on the reception side. Delay profiles can be separated. Therefore, in this case, the transmission antenna number information is set to 2 as shown in Step 016. Conversely, in step 015, the GI When it is determined that ⁇ max is longer than half the length (NO), if transmission is performed using two antennas, delay profiles interfere with each other on the receiving side (Fig. 8 (b) (Refer to), and correct propagation path estimation cannot be performed. Therefore, in this case, without performing transmission using two antennas, the process proceeds to step 017 to set the number of transmission antennas information to 1.
  • the number of transmission antennas information to be fed back to the transmission side is obtained. Therefore, as shown in Step 018, the number of transmission antennas is transmitted using the receiver side transmission device 282 (Fig. 10). Can provide feedback. Based on this transmission antenna number information, the same number of information signal streams as the transmission antenna number information are generated on the transmission side and data packets are transmitted (steps 003 to 005). Therefore, the reception device receives and demodulates the data packets. Can be performed (step 019).
  • the radio communication technique according to the third embodiment of the present invention uses this configuration for base station identification.
  • FIG. 5 shows an example of cell arrangement that is a target of the radio communication technology according to the present embodiment.
  • a base station identification technique in the case where terminal V is located at the boundary of cells covered by three base stations S, T, and U will be described.
  • all base stations shall be synchronized! /, And the same frequency shall be used in all cells.
  • FIG. 6 is a diagram illustrating a configuration example of a base station side transmitting apparatus according to the third embodiment of the present invention. is there.
  • the base station side transmission apparatus includes a preamble A generation unit 100, a preamble B generation unit 101, a phase rotation unit 102, a multiplex unit 103, and an error correction code unit.
  • 104 S / P conversion unit 105, mapping unit 106, IDFT unit 107, P / S conversion unit 108, GI insertion unit 109, D / A conversion unit 110, wireless transmission unit 111,
  • the antenna unit 112 and This configuration example is the same as when the number of transmission antennas is 1 in the first embodiment. It is assumed that all the base stations S, T, U have the same configuration.
  • preamble A generation section 100 and preamble B generation section 101 of the base station apparatus generate preamble A and preamble B, respectively.
  • the preamble B is sent to the phase rotation unit 102.
  • phase rotation section 102 a force that gives continuous phase rotation to each subcarrier of preamble B.
  • the amount of phase rotation given here is set to a different value in each base station. That is, for example, the phase rotation amount is set to 0 for the base station S, 2 ⁇ ⁇ for the base station, and 2 ⁇ for the base station U.
  • m and ⁇ are integers greater than 1 that satisfy m ⁇ n. In this way, by setting a different amount of phase rotation for each base station, it becomes possible to separate the delay profile of the signal arriving at each base station on the terminal side, and to detect a base station that is a candidate for connection. can do.
  • information data in the downlink is error-correction-encoded in the error-correcting encoder 104, and is mapped by the mapping unit 106 via the S / P converter 105 according to the modulation method. Applied.
  • the information data at this time is not the data for the terminal V but the control information broadcast to the whole cell, or the data for the terminal already connected to the base station.
  • the information data generated in this manner is given the same phase rotation as that of the preamble B in the phase rotation unit 102, and then time-multiplexed with the preamble in the multiplex unit 103, and the IDFT unit 107, the P / S conversion unit 108
  • the signal is transmitted from the antenna unit 112 via the GI insertion unit 109, the D / A conversion unit 110, and the wireless transmission unit 111.
  • FIG. 7 is a functional block diagram showing a configuration example of the terminal side receiving apparatus according to the present embodiment.
  • the terminal side receiving apparatus according to the present embodiment Tena unit 150, wireless reception unit 151, A / D conversion unit 152, synchronization unit 153, GI removal unit 154, S / P conversion unit 155, DFT unit (may be FFT) 156, and switching switch 157, a preamble multiplication unit 158, an IDFT unit (IFFT may be used) 159, a delay profile power measurement unit 160, and a demodulation unit 161.
  • the antenna unit 150 simultaneously receives signals transmitted from the base stations S, T, and U.
  • the received signal in which signals transmitted from these base stations are mixed is established in the synchronization unit 153 via the radio reception unit 151 and the A / D conversion unit 152.
  • power preamplifier A that is synchronized using preamble A is a signal common to all base stations, and signals transmitted from the base stations are mixed. Even if you can synchronize.
  • the guard interval is removed from the received signal (preamble B and information data) by the GI removal unit 154, and the signal power in the time domain is transmitted from the DFT unit 156 via the S / P conversion unit 155. Converted to domain signal.
  • received preamble B is sent to preamble multiplier 158 and received data signal is sent to demodulator 161 by switching switch 157.
  • Preamble multiplier 158 multiplies reception preamble B by a value obtained by normalizing the complex conjugate of preamble B used on the transmission side by the square of the amplitude of preamble B.
  • the result of this multiplication is converted into a time domain signal by the IDFT unit 159, the delay profile of the propagation path through which the signal transmitted from each of the base stations S, T, and U passes can be obtained by temporally separating. Is possible.
  • the delay profile file separated for each base station is sent to delay profile power measurement section 160 and demodulation section 161.
  • Delay pro The file power measurement unit 160 measures and compares the power of the first path for each delay profile, and determines which base station power transmitted signal is received with the highest power. As a result, it is possible to try to connect to the base station that transmitted the signal that is determined to be received with the highest power, and the terminal-side transmitter 162 transmits the signal addressed to the base station. It becomes.
  • demodulation section 161 performs propagation path compensation using a delay profile separated for each base station, and demodulates information data such as control information.
  • connection destination candidates are not affected by interference from other cells. Can be identified.
  • the power of the separated delay profile it is possible to accurately determine the base station to be connected.
  • the base station whose power in the first path of the delay profile is measured to be high is selected as the connection destination base station.
  • the power of all paths is summed and the total value is The highest base station may be selected.
  • the delay profiles of the signals transmitted from the respective base stations can be obtained separately.
  • the delay profile of the signal that also arrives at the base station power of the adjacent cell is calculated, and the base station that is a candidate for the handover destination is detected. It is also possible. In this case, a base station that has transmitted a signal from which a delay profile file having the highest power is obtained is selected as a handover destination base station from delay profiles other than the connected base station.
  • site diversity soft combine reception
  • site diversity can be easily performed by simultaneously transmitting data to a certain terminal from a plurality of adjacent base station apparatuses. it can. This makes it possible to improve reception characteristics at terminals located near the cell boundary.
  • each base station in the cellular system transmits a preamble with a different phase rotation, so that the receiving side can transmit the preamble.
  • the connection destination base is based on the delay profile measured separately. It is characterized by selecting a station.
  • each base station has a plurality of antennas, that is, a system in which each base station uses the scheme such as the transmit antenna selection diversity shown in the first embodiment. When applied, it is necessary to simultaneously identify the base station and identify multiple antennas provided in the base station.
  • the number of delay profiles to be separated is (number of base stations) X (number of antennas of each base station), which is very large. In this way, it must be separated! /, And the number of delay profiles is large, the following problems occur. This problem will be explained with reference to Fig. 8.
  • base stations K, L, and M are arranged in three cells, respectively, and base stations K, L, and M are antenna 1 and antenna 2, respectively. have. Then, in the situation where the edge [is located near the boundary of the three cells, when applying the first embodiment or the third embodiment described above, the antenna of each base station A different phase rotation is given to preamble B every time, and the delay profile of the transmission path through which the signal transmitted from each antenna of each base station passes is separated at the terminal. Thus, when there are many objects to be separated and delayed waves, the difference in the amount of time shift given to each antenna is reduced. Therefore, as shown in FIG. 8 (b), the delay profiles after separation may interfere with each other. In the example shown in Fig.
  • each base station when a terminal transmits a delay profile of a signal transmitted from each antenna of each base station, each base station The delay profiles of the stations are separated by a unique blumble pattern for each base station, and the delay profile for each antenna provided in each base station is time-shifted (phase rotation) as in the first and third embodiments. By volume).
  • the transmission apparatus of each base station can be realized with the same configuration as shown in FIG.
  • preamble B needs to use a unique pattern for each base station.
  • the amount of phase rotation in the phase rotation units 012 and 013 needs to be set to a different value for each antenna.
  • the phase rotation amount may be set to a common value for each base station.
  • the terminal side receiving apparatus can also be realized by the configuration shown in FIG.
  • the preamble multiplication unit 158 stores the preamble pattern for each base station (in the situation shown in FIG. 8, the preamble patterns used by the base stations K, L, and M, respectively), and The received signal mixed with the transmitted signal is multiplied by each preamble pattern to separate the delay profile for each base station.
  • the received signal is multiplied by the preamble pattern used at base station L
  • only the delay profile of the propagation path through which the signals transmitted by the two antenna power of base station L are obtained is obtained.
  • the received signal is multiplied by the preamble pattern used at base station M
  • only the delay profile of the propagation path through which the signals transmitted by the two antenna forces of base station M have passed is obtained.
  • the delay profile by shifting the time waveform by applying continuous phase rotation to each subcarrier of the preamble on the transmission side.
  • the base station has a high number of delay profiles to be separated, such as when the base station is equipped with multiple antennas. Accurate delay profile measurement, that is, base station identification and antenna selection can be performed.
  • the delay profile for each antenna is separated using a different preamble pattern for each antenna, and a different time shift for each base station is given to the preamplifier, so that each base station has a different time shift.
  • a technique for separating the delay profiles can also be used.
  • the present invention can be used for a wireless communication system.

Abstract

L'invention vise à améliorer la précision d'une estimation de voie de propagation dans le cas d'une réception de signaux par l'intermédiaire d'une pluralité d'antennes. Un appareil de transmission au niveau d'une extrémité station de base comprend une unité de génération de préambule A (010), une unité de génération de préambule B (011), des unités de rotation de phase (012, 013), des unités de multiplexage (014, 015), une unité de codage de correction d'erreur (016), une unité de conversion P/S (017), une unité de mappage (018), un commutateur (019), des unités IDFT (020, 026) pouvant être remplacées par des unités IFFT, des unités de conversion P/S (021, 027), des unités d'insertion d'intervalle de sécurité (022, 028), des unités de conversion numérique-analogique (023, 029), des unités de radiotransmission (024, 030), et des unités d'antenne (025, 031). L'unité de génération de préambule A (010) et l'unité de génération de préambule B (011) génèrent respectivement les préambules A et B (voir format de paquet dans Fig. 1). Le préambule A est envoyé en sortie vers les unités de multiplexage (014, 015), le préambule B étant envoyé en sortie vers les unités de rotation de phase (012, 013). Les unités de rotation de phase (012, 013) soumettent ensuite chacune des sous-porteuses du préambule B à une rotation de phase continue. Dans un appareil de transmission d'extrémité station de base du présent mode de réalisation, seule l'unité de rotation de phase (013), et non pas l'unité de rotation de phase (012), soumet le préambule B à une rotation de phase.
PCT/JP2006/300422 2005-01-17 2006-01-16 Appareil de communication WO2006075733A1 (fr)

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EP06711703.6A EP1843499B1 (fr) 2005-01-17 2006-01-16 Transmission stable et réception fiable de plusieurs flux signaux dans un système de communication de type MIMO
JP2006553002A JP4569929B2 (ja) 2005-01-17 2006-01-16 通信装置
US12/752,797 US8514962B2 (en) 2005-01-17 2010-04-01 Communication device
US13/669,383 US8743993B2 (en) 2005-01-17 2012-11-05 Communication device
US14/254,529 US20140226564A1 (en) 2005-01-17 2014-04-16 Communication device
US15/189,867 US10833903B2 (en) 2005-01-17 2016-06-22 Communication device
US17/082,422 US11283659B2 (en) 2005-01-17 2020-10-28 Communication device

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